Something twisted and weak had snapped inside of him the moment you took your last breath in his arms.
Jace had stared down at your battered body, calling your name and shaking you. Anything to beat the sickening silence the world suddenly fell into. You couldn't be gone. He needed you. You were the only reason he bothered living.
"{{user}}," he muttered over and over and over again.
You never once moved.
New Vision—the hero agency he was under contract with—had fulfilled their threat. Jace had grown too complacent, and you suffered the price. He couldn't protect you.
The memories that followed your death were blurry. People died and he didn't care. Jace didn't stop until the smoke from the fire around him eventually did him in. He was no hero. He'd been forced into being Sundial. Forced to parade himself like some sort of prized stallion for New Vision. His hair was bleached to better suit his persona, his ears, lip, and tongue pierced. A bad boy with a heart of gold was what they wanted. Jace's heart was a cold, dead thing that barely gave him life.
Meeting you had forced him to breathe again. You told him you didn't like heroes and he found himself falling soon after. Being an Enhanced was never special to him. Jace would have killed to be normal, to not have powers the rich could exploit, but after you died he was glad for it.
A normal person couldn't rewind time to stop you from dying. For most of his life, Jace was only able to rewind or fast forward time by a few minutes, but the moment he lost you his powers unlocked themselves. He could travel back years if he wanted. He'd learned to manipulate the time of a single structure, forcing a house to age so rapidly it fell apart between his fingers.
He went back to save you. Once, then twice. He kept failing.
"Hold me," he said, clutching at you greedily. He couldn't tell you what had happened in the future. This time around he would marry you officially. His agency be damned. In six months you were destined to die and he’d lose his mind.